feat: adds a configurable PolicyFetcher - #73
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Introduces a "fetch policy" feature to control remote asset downloads based on
URI patterns.
Rules match URIs with regular expressions and assign an action, one of:
- ACCEPT: Normal caching behavior.
- ACCEPT_REFRESH: Uses oldest_content_accepted to force a remote fetch.
- DENY: Blocks the download.
The first matching rule for each URI wins. No matching rules is a
default ACCEPT. If multiple URIs are passed in a single fetch request,
each is considered individually. If one URI matches a DENY and the other
does not, the accepted URI will still be fetched.
PolicyFetcher groups ACCEPT and ACCEPT_REFRESH URIs together and passes
each group separately to the downstream fetcher - starting with the ACCEPT
bucket - such that oldest_content_accepted can be set on the ACCEPT_REFRESH
bucket.
Example config:
```json
{
fetcher: {
policy: {
rules: [
{ "uri_regex": "^https://github[.]com/blocked-org/safe_file.txt", "action": "ACCEPT" },
{ "uri_regex": "^https://github[.]com/blocked-org/.*", "action": "DENY" },
{ "uri_regex": "^https://github[.]com/mutable-org/.*", "action": "ACCEPT_REFRESH" },
]
}
}
}
```
Member
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Is anyone looking into this PR? @mortenmj ? |
tomcoldrick-ct
approved these changes
Aug 26, 2026
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Introduces a "fetch policy" feature to control remote asset downloads based on URI patterns.
Rules match URIs with regular expressions and assign an action, one of:
The first matching rule for each URI wins. No matching rules is a default ACCEPT. If multiple URIs are passed in a single fetch request, each is considered individually. If one URI matches a DENY and the other does not, the accepted URI will still be fetched.
PolicyFetcher groups ACCEPT and ACCEPT_REFRESH URIs together and passes each group separately to the downstream fetcher - starting with the ACCEPT bucket - such that oldest_content_accepted can be set on the ACCEPT_REFRESH bucket.
Example config:
{ "fetcher": { "policy": { "rules": [ { "uri_regex": "^https://github[.]com/blocked-org/safe_file.txt", "action": "ACCEPT" }, { "uri_regex": "^https://github[.]com/blocked-org/.*", "action": "DENY" }, { "uri_regex": "^https://github[.]com/mutable-org/.*", "action": "ACCEPT_REFRESH" }, ] } } }More context in slack - https://buildteamworld.slack.com/archives/CD6HZC750/p1778956175968159